TM 5-3610-285-14
Standard Filters
Gold Wratten #106
Red Wratten #25
Green Wratten #58
Blue Wratten #47
Lamp Life
20,000+ hours
Dimensions
Densitometer
Width
15.25 in. (38.73 cm)
Height
4.00 in. (10.16 cm)
Depth
12.00 in. (30.48 cm)
Transmission Probe
Width
15.25 in. (38.73 cm)
Height
19.50 in. (49.53 cm)
Depth
11.00 in. (27.94 cm)
Reflection Probe
Width
2.25 in. (5.71 cm)
Height
2.625 in. (6.66 cm)
Depth
5.25 in. (13.33 cm)
7-3.
TECHNICAL PRINCIPLES OF OPERATION.
7-3.1
General. The digital densitometer is a self-contained light measuring instrument. It consists of the densitometer,
transmission probe, and reflection probe.
a.
Reflection Probe. The reflection probe directs light from a lamp through a lens and mirror optical system and
strikes the unknown sample. Diffused light from the surface of the sample is collected by a group of fiber optic bundles.
The bundles direct the light to the densitometer, where it is translated into a density measurement and displayed as a
digital readout.
b.
Transmission Probe. Within the transmission probe, light from a lamp is filtered by an infrared rejection filter,
then directed through a condensing lens and mirror system and on through an aperture assembly. The light strikes the
unknown sample and all diffused light passing through the sample is collected by a diffuser and group of fiber optic
bundles, where it is directed to the densitometer and passes through a filter. From there, it is translated into a density
measurement, which is displayed in the digital readout.
7-3
